Characterization and Power Measurement of IPV Cells

For a reliable operation of energy autarkic Internet of Things (IoT) devices, a sufficient power supply is required. If the energy generation is realized with indoor photovoltaic (IPV) cells, their performance must be measured within the scope of quality management. However, the established methods for outdoor photovoltaics, as described in the IEC 60904 standards series, cannot be used one‐to‐one for this purpose. Instead, the special properties of the indoor application scenarios must be considered both in the standardized measurement conditions and in the measurement methods. As standardized spectra, since the spectrum of a white light LED is already standardized in photometry, the spectrum of a fluorescent lamp and the AM1.5 spectrum of natural sunlight can be used, each normalized to an illuminance of about 1000 lux, i.e., 100 times less than standard test conditions for outdoor measurements require. The corresponding light sources can be used for secondary calibration of IPV cells and the standard DSR method is very well suited for the high accuracy primary calibration and a comprehensive characterization of IPV cells.